report that in some cases this difference might contribute to disease processes. Monoallelically expressed genes are distributed ... in situ hybridization and allele-specific RT-PCR, revealed ...

Genetic variation describes naturally occurring genetic differences among individuals ... by a population or is the only allele present at a particular gene locus within a population.

This gene makes people sensitive to some bitter chemicals, such as phenylthiocarbamide (PTC) and propylthiouracil (PROP).

The height of pea plants is controlled by a single gene which has two alleles: tall and short. The tall allele is dominant and is shown as T. The small allele is recessive and is shown as t.